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Port 19191 (opsec-uaa)

IANA assigns port 19191 to opsec-uaa: OPSEC UAA.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
opsec-uaa TCP OPSEC UAA Reuven Harrison -
opsec-uaa UDP OPSEC UAA Reuven Harrison -

Check what is listening on port 19191

Linux: is anything listening on TCP 19191?
sudo ss -tlnp 'sport = :19191'
Linux: UDP 19191
sudo ss -ulnp 'sport = :19191'
Linux / macOS: which process owns the port
sudo lsof -nP -i :19191
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':19191 '
Windows (Command Prompt)
netstat -ano | findstr :19191
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 19191 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 19191
From Windows
Test-NetConnection HOST -Port 19191
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 19191

Block port 19191 in the firewall

ufw
sudo ufw deny 19191/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 19191 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 19191 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 19191' -Direction Inbound -Protocol TCP -LocalPort 19191 -Action Block
ufw
sudo ufw deny 19191/udp
iptables
sudo iptables -A INPUT -p udp --dport 19191 -j DROP
nftables
sudo nft add rule inet filter input udp dport 19191 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 19191' -Direction Inbound -Protocol UDP -LocalPort 19191 -Action Block

Related ports

19007scintilla19020j-link19194ua-secureagent19220cora, cora-disc

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.